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Full Discussion: Help with calculator code
Top Forums Shell Programming and Scripting Help with calculator code Post 302391547 by dpc.ucore.info on Monday 1st of February 2010 05:38:59 PM
Old 02-01-2010
Hi,

I'm learning sed with:
Sed - An Introduction and Tutorial

So:


Ask for expresion:
Code:
echo "Enter the expression:\c"
read express

Appended some precision variable (must have been definited before) and run through bc (calculator)
Code:
eval echo "$express"|sed 's/^/'$precision' \
/'|bc -l|\


Don't print anything if not request by /p argument (-n switch) on every line (1,$).

Code:
    sed -n '1,${

If no "syntax" in line was found - don't print nothing.
Code:
        /syntax/!{
        }

For lines that do contain "syntax" word:
Code:
        /syntax/{

... append more explanation:
Code:
            a\
                Possible causes:\
                1. Error in expression\
                2. Variable not enclosed in (), supplied -ve value\
                3. Exponents given as non-integers
        }

Finally, print the word first word (string/digits) of lines which are starting with whitespaces. I guess this is a format of bc final result.

Code:
 
        s/\([ ]*\)\([^ ]*\)/\2/p
    }'


Not bad for an hour of reading, I guess. Please correct me if I'm wrong - I'm just learning.
Last edited by dpc.ucore.info; 02-01-2010 at 06:43 PM.. Reason: fixes
 

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